PubMed Health⌕ Search

Biomedical subjects

K Murugesan

Publications and source records attributed to K Murugesan.

At least 37 records · Page 2Linked to original sources
PubMed1993

Evaluation of direct gas-liquid chromatography of CSF in rapid diagnosis of acute bacterial meningitis.

A comparison of culture and lactic acid level from 50 patients suffering from bacterial meningitis and 25 controls was done to evaluate the role of direct GLC analysis of CSF for early diagnosis of bacterial meningitis. The study revealed that the CSF lactic acid level was higher in 48 out of 50 cases. Only in 30 patients the causative agent of the disease could be established by conventional techniques. Quantitative estimation of lactic acid was found to be useful.

Acute Disease↗
PubMed1991

Bioavailability of norethindrone and menstrual pattern after insertion of norethindrone acetate implants in rhesus monkeys.

Subdermal silastic implants releasing norethindrone acetate were inserted in five rhesus monkeys for a period of seven months. The serum norethindrone (NET) levels were estimated from blood samples collected fortnightly. There was an initial high level of NET followed by fluctuating levels of NET in 4 out of five monkeys. The serum NET values showed individual variation between time periods as well as between monkeys. The analysis of menstrual cycles showed initial amenorrhoea up to day 120-140 in four out of five monkeys. Only one monkey showed vaginal bleeding pattern comparable to normal menstrual cycles; this monkey had serum NET levels less than 10 ng/ml. The pharmacokinetic and pharmacodynamic parameters were similar to those reported in the human female.

Amenorrhea↗
PubMed1991

DDT levels in human body fat & milk samples from Delhi.

A study of 45 human fat samples from autopsy and surgery specimens from Delhi showed a mean total DDT level of 6.37 micrograms/g (SE +/- 0.36; range 3.34-9.12 micrograms/g). While these values compare well with those reported from India and abroad, they are much lower than those obtained from other areas of Delhi, confirming wide variation in the quantity of DDT sprayed in different pockets of this city. Twenty one human milk samples from Delhi showed a mean total DDT level of 0.144 ppm (micrograms/ml). Thus, many infants in Delhi appear to be consuming 3 to 5 times the permissible 5 micrograms/kg/day quantity of DDT. This study too indicates the need of continuous monitoring of DDT and other insecticides commonly used in India.

Adipose Tissue↗
PubMed1990

Functional estrogen receptors as biochemical marker for the detection of hormone-dependent breast cancer.

The translocatable receptors categorized as functional receptors were quantitated in a cross-incubation study of breast cancer nuclei with receptor-rich uterine cytosol. Data demonstrated that tumors that contained cytosolic estrogen receptor (ER) but had translocation defect might not be hormone dependent, whereas tumors with low ER but intact nuclear translocation step will respond to antiestrogen therapy. Cytosolic ER was estimated in 114 primary breast cancer tissues and ten metastatic axillary lymph nodes; 58% of postmenopausal and 54% of premenopausal breast cancer tissues were ER+ with a cutoff value of 10 fmoles and 3 fmoles/mg protein, respectively. Of tumors in the premenopausal and postmenopausal state, 62% and 57%, respectively, were positive for nuclear ER, with a cutoff value of 10 fmoles/100 micrograms DNA. This study suggested that evaluation of functional ER level would reduce the number of false-negative and false-positive tumors.

Adult↗
PubMed1990

Progestin and antiprogestin interactions with progesterone receptors in human myomas.

Progesterone receptors (PRs) in human fibromyomata (myomas) and normal myometrium were characterized by gel filtration, sucrose gradient sedimentation analysis, isoelectrofocusing and ligand specificity. The PR population in myoma tissues, 1242 +/- 505 fmol/mg protein, was 3-fold higher than normal myometrial tissues under similar hormonal milieu. The increased PR concentration in myomas appears to be of potential importance in physiopathology of fibromyoma.

Chromatography, Gel↗
PubMed1990

Modulation of steroid production in goat ovarian cells: effect of progestins and antiprogestins.

Effect of various synthetic progestins and antiprogestational compounds on progesterone (P) and estradiol (E) production by isolated goat ovarian granulosa (G) and corpus luteum (CL) cell types was studied in vitro. Steroid production was studied either under basal conditions or after stimulation with follicle stimulating hormone (FSH) in the presence of aromatase substrate, androstenedione (A). None of the progestins had any significant effect on basal P and E production by either cell types during 48 hour of culture. The FSH and A - induced increase in P and E production was significantly inhibited following concommitant treatment with synthetic progestins at concentrations higher than 10(-7) M. The added progestins had no effect on G and CL cell viability. None of the antiprogestational compounds had any significant effect on basal steroid production in either of the cell types. Furthermore, the higher concentrations of three antiprogestins namely RMI 14156, STS 557 and isomer 201 of RMI 12936, were found to stimulate significantly the basal as well as FSH + A - induced production of estradiol in both the cell types. In contrast, the other two antiprogestins tested were found to stimulate the gonadotropin + A - induced production of P. These results indicate that exogeneous progestins directly inhibit the gonadotropin + androstenedione - induced steroid production by G and CL cells in vitro. Moreover, different antiprogestin had different effect on the modulation of steroid production.

Androstenedione↗
PubMed1989

Interaction of antiprogestins with progesterone receptors in rat uterus.

Cytosolic and nuclear progesterone receptors (PRc and PRn) under antiprogestin treatment were measured in rat deciduoma and compared with values for contralateral (nondeciduomatous) rat uterine tissue. Uterine PRc and PRn of the progesterone treated group were 101 +/- 8.7 and 4770 +/- 590 fmol/mg DNA respectively. After treatment with antiprogestins STS-557, 5 alpha-DNE, (5 alpha-dihydronorethisterone), 5 alpha-DNG (5 alpha-dihydronorgestrel), RU-22092 and RU-16556, PRc in the nondeciduomatous control horn ranged from 127 to 377 fmol/mg DNA and PRn from 2785 to 17925 fmol/mg DNA. In the decidual tissue, PRc decreased significantly (4.6 +/- 0.8 fmol/mg DNA) on 5 alpha-DNG treatment as compared with the progesterone alone treatment group (147 +/- 3.8). PRn in decidual tissue also decreased maximally on 5 alpha-DNG treatment. These results suggest that the interaction of antiprogestins may not be identical in control uterine tissue and in deciduoma.

Animals↗
PubMed1989

Effect of progestins, estradiol, and coenzymes NAD and NADPH on the interconversion of estradiol and estrone in rabbit uterus in vitro.

The biotransformation of estradiol (E2) and estrone (E1) in the uterus of rabbits treated with norgestrel (NG), norethindrone (NET), norethindrone acetate (NETA), progesterone (P4), and E2 either by subcutaneous injection in oil or by intrauterine steroid-releasing silastic implants was carried out under an in vitro short-term incubation system. The studies have shown that E2 stimulates 17 beta-hydroxysteroid dehydrogenase (17 beta-OHSD) much more than P4 as compared to untreated controls. The kinetic studies on E2 metabolism in the presence of added coenzyme NAD showed an initial rapid estrone formation and a gradual reconversion of E1 to E2. The addition of NADPH, ATP, and glucose-6-phosphate facilitates the reconversion of E1 to E2. The interconversion of E2 and estrone in the presence of coenzymes was five- to ten-fold higher in the endometrium than in the myometrium per milligram protein. Both E2 and progestins stimulate the uterine 17 beta-OHSD activity in rabbit uterus. This study further suggested that the hormone-induced metabolism of estradiol and estrone in the rabbit uterus is essentially modulated by the availability of coenzymes.

17-Hydroxysteroid Dehydrogenases↗
PubMed1989

Standardisation of quantitative direct gas liquid chromatography for early detection of bacteria in blood cultures.

Blood cultures with strains of aerobic, facultative and obligate anaerobic bacteria were studied by quantitative direct gas liquid chromatography for early diagnosis of bacteraemias. Small amounts of volatile and nonvolatile fatty acids were detected in uninoculated blood cultures. Bacteroides fragilis produced acetic (27.6 mumol/ml), propionic (1.0 mumol/ml), isovaleric, (0.6 mumol/ml), lactic (4.5 mumol/ml) and succinic (2.7 mumol/ml) acids after 48 h. Blood cultures inoculated with Clostridium perfringens and Fusobacterium nucleatum produced large amount of butyric acid (2.5 and 18.8 mumol/ml respectively) along with acetic, propionic, lactic and succinic acids on day 2 of incubation. Blood cultures with Escherichia coli, Salmonella typhi, Staphylococcus aureus, beta-haemolytic streptococci (group A) produced only acetic, lactic and succinic acids. Pseudomonas aeruginosa produced only small amounts of succinic (0.6 mumol/ml) and acetic acids (2.4 mumol/ml) on day 5 of incubation. Blood cultures inoculated with anaerobic bacteria produced multiple volatile fatty acids within 24 to 48 h of incubation. Since these acids could be detected earlier than the organism in cultures, they may be useful in the early diagnosis of anaerobic bacteraemias/septicaemias.

Bacteria, Anaerobic↗
PubMed1988

Glucocorticoid receptors in bronchoalveolar lavage fluid in sarcoidosis. A preliminary report.

Glucocorticoid receptor (GR) content was measured in bronchoalveolar lavage fluid (BALF) cells of 20 untreated patients with sarcoidosis. A significantly higher (p less than 0.001) lymphocyte count and GR content of BALF cells was noted in patients with sarcoidosis as compared to normal volunteers. The GR content correlated positively with lymphocytes (%) (r = 0.6; p less than 0.01) and was significantly higher (p less than 0.001) in patients who showed roentgenographic improvement, physiologic improvement, and improvement in both parameters compared to those who did not show improvement. Above findings suggest that the GR content of BALF cells is increased in sarcoidosis and a major contribution to this may be made by the lymphocytes.

Adult↗
PubMed1987

DDT and its metabolites in leiomyomatous and normal human uterine tissue.

Residues of dichlorodiphenyltrichloroethane (DDT) and its metabolites were monitored in leiomyomatous and normal human uterine tissue by gas-liquid chromatography (GLC). The metabolites detected were: 2,2-bis-(p-chlorophenyl)-1,1-dichloroethylene (p,p'-DDE), 2-(o-chlorophenyl)-2-(p-chlorophenyl)-1,1,1-trichloroethane (o,p'-DDT), 2,2-bis-(p-chlorophenyl)-1,1-dichloroethane (p,p'-DDD) and 2,2-bis-(p-chlorophenyl)-1,1,1-trichloroethane (p,p'-DDT). Total DDT ranged from 0.245 to 1.982 ppm, with a mean value of 0.845 ppm in leiomyomatous tissue. In normal human uterine tissue, total DDT ranged from 0.030 to 0.282 ppm, with a mean value of 0.103 ppm. Significantly higher levels of DDT and its metabolites in leiomyomatous tissue as compared to normal uterine tissue suggest their involvement in uterine leiomyomas. The data is discussed in the light of existing knowledge on estrogenic activity of DDT analogs and estrogen-influenced growth of uterine leiomyomas.

Adult↗
PubMed1987

Steroid production in vitro by granulosa, theca, and luteal cells from goat ovaries.

Basal progesterone (P4) production by isolated goat ovarian cells in vitro was in the order corpus luteum (CL) greater than granulosa (G) greater than theca (TH), while estradiol (E2) production was in the order TH greater than G greater than CL. In G cells, various concentrations (0.01 to 100 micrograms/ml) of luteinizing hormone (LH), human chorionic gonadotropin (hCG) and follicle-stimulating hormone (FSH) increased P4 and E2 secretion. Testosterone (T, 10(-9) to 10(-5) M) produced dose-dependent increases in P4 and E2 secretion. Testosterone and LH together had an additive effect on E2 secretion. The combined effect of the lower (less than 10(-6) M) concentrations of T and LH on P4 production was marginally higher than either agent alone, but the increase was statistically insignificant; at higher concentrations of T (10(-6) and 10(-5) M) in combination with LH, P4 secretion was similar to that with LH alone, but was significantly (p less than 0.01 and less than 0.001, respectively) less compared to that with T alone. Follicle-stimulating hormone and T together produced a synergistic effect on E2 and an additive effect on P4 production. In TH cells, a dose-dependent increase in P4 and E2 production was observed with LH and hCG, but the effect of FSH was not significant. Testosterone produced a dose-dependent increase in P4 and E2 secretion. Testosterone and LH together induced higher steroid production than either agent alone. However, the increase was not statistically significant compared to T alone.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Synthetic antiprogestins stimulate human granulosa cell estradiol production in vitro.

The effect of synthetic antiprogestins, RMI 14156 and STS 557, on gonadotrophin stimulated estradiol (E2) production in human ovarian granulosa cells (GC) has been tested in vitro, to see if by virtue of their antiprogestational activity these compounds would promote the production of E2, and thereby follicular growth. Granulosa cells from human ovaries were cultured in modified minimum essential medium with or without luteinising hormone (LH, 10 ng/ml), follicle stimulating hormone (FSH, 100 ng/ml), androstenedione (A, 10(-7) M), RMI 14156 (10(-9) M-10(-5) M) and STS 557 (10(-9) M-10(-5) M), in a humidified 95% air 5% CO2 atmosphere at 37 degrees C for 48 hours. RMI 14156 and STS 557 were found to stimulate the production of E2 by cultured human GC in a dose dependent manner, the stimulation being significant (P less than 0.001-P less than 0.05) at higher doses (10(-6) M, 10(-5) M). The two antiprogestins used also stimulated the gonadotrophin induced E2 production significantly. Results demonstrated that these synthetic antiprogestins, having an 'estra' type of basic structure RMI 14156 17 beta hydroxy-7 alpha-methyl-5-estra-en-3-one); STS 557 (17 alpha-cyanomethyl-17 beta-hydroxy-estra-4,9(10)diene-3-one) can directly promote E2 production from human ovarian GC in vitro.

Adult↗